The staple crop for Japanese agriculture from the earliest period was

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Quizplus · Accepted Answer

Wet rice has been the staple crop for Japanese agriculture from the earliest period. It is well-suited to the country's climate and terrain and provides a steady source of food and income for farmers. Millet and wheat were also grown to a lesser extent, but wet rice remained the most important crop. Tea and hemp were not staple crops for Japanese agriculture.

The Staple Crop for Japanese Agriculture from the Earliest Period